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ixgbevf: Cleanup accounting for space needed at start of xmit_frame 

This change cleans up the accounting needed at the start of xmit_frame so
that we can avoid doing too much work to determine how many descriptors we
will need.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Tested-by: Sibai Li <sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2012-05-11 08:32:40 +00:00 committed by Jeff Kirsher
parent e2c28ce760
commit 3595990a9c
1 changed files with 24 additions and 22 deletions
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46
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View File

@ -175,10 +175,8 @@ static void ixgbevf_unmap_and_free_tx_resource(struct ixgbevf_adapter *adapter,
#define IXGBE_MAX_DATA_PER_TXD (1 << IXGBE_MAX_TXD_PWR)
/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) (((S) >> IXGBE_MAX_TXD_PWR) + \
(((S) & (IXGBE_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
#define DESC_NEEDED (TXD_USE_COUNT(IXGBE_MAX_DATA_PER_TXD) /* skb->data */ + \
MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1) /* for context */
#define TXD_USE_COUNT(S) DIV_ROUND_UP((S), IXGBE_MAX_DATA_PER_TXD)
#define DESC_NEEDED (MAX_SKB_FRAGS + 4)
static void ixgbevf_tx_timeout(struct net_device *netdev);
@ -2932,33 +2930,37 @@ static int ixgbevf_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
unsigned int tx_flags = 0;
u8 hdr_len = 0;
int r_idx = 0, tso;
int count = 0;
unsigned int f;
u16 count = TXD_USE_COUNT(skb_headlen(skb));
#if PAGE_SIZE > IXGBE_MAX_DATA_PER_TXD
unsigned short f;
#endif
tx_ring = &adapter->tx_ring[r_idx];
/*
* need: 1 descriptor per page * PAGE_SIZE/IXGBE_MAX_DATA_PER_TXD,
* + 1 desc for skb_headlen/IXGBE_MAX_DATA_PER_TXD,
* + 2 desc gap to keep tail from touching head,
* + 1 desc for context descriptor,
* otherwise try next time
*/
#if PAGE_SIZE > IXGBE_MAX_DATA_PER_TXD
for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
#else
count += skb_shinfo(skb)->nr_frags;
#endif
if (ixgbevf_maybe_stop_tx(netdev, tx_ring, count + 3)) {
adapter->tx_busy++;
return NETDEV_TX_BUSY;
}
if (vlan_tx_tag_present(skb)) {
tx_flags |= vlan_tx_tag_get(skb);
tx_flags <<= IXGBE_TX_FLAGS_VLAN_SHIFT;
tx_flags |= IXGBE_TX_FLAGS_VLAN;
}
/* four things can cause us to need a context descriptor */
if (skb_is_gso(skb) ||
(skb->ip_summed == CHECKSUM_PARTIAL) ||
(tx_flags & IXGBE_TX_FLAGS_VLAN))
count++;
count += TXD_USE_COUNT(skb_headlen(skb));
for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
count += TXD_USE_COUNT(skb_frag_size(&skb_shinfo(skb)->frags[f]));
if (ixgbevf_maybe_stop_tx(netdev, tx_ring, count)) {
adapter->tx_busy++;
return NETDEV_TX_BUSY;
}
first = tx_ring->next_to_use;
if (skb->protocol == htons(ETH_P_IP))